Mobility of Ni versus Zr in an amorphous Ni-Zr alloy

Barbour, J. C.; Nastasi, M.; Mayer, J. W.
February 1986
Applied Physics Letters;2/24/1986, Vol. 48 Issue 8, p517
Academic Journal
A method for determining the dominant diffusing constituent in a binary amorphous alloy is demonstrated with the Ni-Zr system. Nickel is the dominant moving species in an amorphous Ni-Zr alloy near the a-Ni50Zr50 composition at 250 °C. In comparison to the Ni, the Zr has a negligible mobility under similar thermodynamic driving forces. Rutherford backscattering spectrometry is used to measure the change in the concentration of a thin film of Ni between thick amorphous layers. Based upon the change in the Ni profile, the diffusivity of Ni in an amorphous Ni-Zr alloy is between 1×10-17 and 1×10-16 cm2/s at 250 °C.


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